MAGNETIC FLUID DETECTION DEVICE AND MAGNETIC FLUID DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a magnetic fluid detection device which can has simple structure and can be made low-priced by materializing high noise resistance.SOLUTION: The magnetic fluid detection device comprises: a magnetic sensor 10a for detecting a magnetic signal generated from a magnetic fluid retained inside a body; sine wave transmission means 21 for transmitting a sine wave; and detection means 22 which uses as a reference signal, the sine wave transmitted from the sine wave transmission means 21 and uses as a sensor signal, a sine wave input to the magnetic sensor from the sine wave generating means 21 then output, compares a phase difference between the reference signal and the sensor signal to detect the magnetic fluid.SELECTED DRAWING: Figure 1